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            <small>
              <a href="#Procedure">Procedure<br></a>
              <a href="#Abstract">Abstract<br></a>
              <a href="#Required_Reading">Required_Reading<br></a>
              <a href="#Keywords">Keywords<br></a>
              <a href="#Brief_I/O">Brief_I/O<br></a>
              <a href="#Detailed_Input">Detailed_Input<br></a>

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              <small>               <a href="#Detailed_Output">Detailed_Output<br></a>
              <a href="#Parameters">Parameters<br></a>
              <a href="#Exceptions">Exceptions<br></a>
              <a href="#Files">Files<br></a>
              <a href="#Particulars">Particulars<br></a>
              <a href="#Examples">Examples<br></a>

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              <small>               <a href="#Restrictions">Restrictions<br></a>
              <a href="#Literature_References">Literature_References<br></a>
              <a href="#Author_and_Institution">Author_and_Institution<br></a>
              <a href="#Version">Version<br></a>
              <a href="#Index_Entries">Index_Entries<br></a>
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<h4><a name="Procedure">Procedure</a></h4>
<PRE>
   SpiceBoolean iswhsp_c ( ConstSpiceChar * string ) 

</PRE>
<h4><a name="Abstract">Abstract</a></h4>
<PRE>
 
   Return a boolean value indicating whether a string contains
   only white space characters.
 </PRE>
<h4><a name="Required_Reading">Required_Reading</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Keywords">Keywords</a></h4>
<PRE>
 
   FILES,  TEXT 
 

</PRE>
<h4><a name="Brief_I/O">Brief_I/O</a></h4>
<PRE>
 
   Variable  I/O  Description 
   --------  ---  -------------------------------------------------- 
   string     I   String to be tested.
    
   The function returns the boolean value SPICETRUE if the string is
   empty or contains only white space characters; otherwise it returns 
   the value SPICEFALSE.
 </PRE>
<h4><a name="Detailed_Input">Detailed_Input</a></h4>
<PRE>
   string     is a character pointer designating a string to be 
              searched for non-white-space characters.
              </PRE>
<h4><a name="Detailed_Output">Detailed_Output</a></h4>
<PRE>
   The function returns the boolean value SPICETRUE if the string 
   contains only white space characters; otherwise it returns the 
   value SPICEFALSE.
   
   White space characters are those in the set
              
      { ' ', '\f', '\n', '\r', '\t', '\v' }
                 
               </PRE>
<h4><a name="Parameters">Parameters</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Exceptions">Exceptions</a></h4>
<PRE>
 
   1)  If the input string pointer is null, the error SPICE(NULLPOINTER)
       is signaled.
    
   2)  An empty string, that is a string with a null character
       at index 0, is considered to be blank.
   </PRE>
<h4><a name="Files">Files</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Particulars">Particulars</a></h4>
<PRE>
 
   This routine provides a short cut for testing lines for the presence
   of non-blank characters; this is a test which is performed frequently
   in CSPICE.
    </PRE>
<h4><a name="Examples">Examples</a></h4>
<PRE>
 
   1) Read a text file; print the non-blank lines.   
   
         #include &lt;stdio.h&gt;
         #include &quot;SpiceUsr.h&quot;
         
         void main()
         {
            #define MAXLEN 82

            FILE          *fptr;
            SpiceBoolean   eof;
            SpiceChar      line [MAXLEN];
            
            
            txtopr_c ( &quot;myfile&quot;, &amp;fptr );
            
            readln_c ( fptr, MAXLEN, line, &amp;eof );
            
            while ( !eof )
            {
               if ( !<b>iswhsp_c</b>(line) )
               {
                  printf ( &quot;%s\n&quot;, line );
               }
            
               readln_c ( fptr, MAXLEN, line, &amp;eof );
            }
         }
 </PRE>
<h4><a name="Restrictions">Restrictions</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Literature_References">Literature_References</a></h4>
<PRE>
 
   1)  &quot;American National Standard for Programming Languages -- C,&quot;
        Published by the American National Standards Institute, 1990. 
        Section 7.3.1.9., p. 104.
 </PRE>
<h4><a name="Author_and_Institution">Author_and_Institution</a></h4>
<PRE>
 
   N.J. Bachman (JPL) 
 </PRE>
<h4><a name="Version">Version</a></h4>
<PRE>
 
   -CSPICE Version 1.1.0, 27-AUG-1999 (NJB)

      Now checks for null input string.
      
   -CSPICE Version 1.0.0, 24-FEB-1999 (NJB)

      Arguments passed to isspace are now cast to unsigned char to 
      suppress compilation warnings on some systems.

   -CSPICE Version 1.0.0, 08-FEB-1998 (NJB)
</PRE>
<h4><a name="Index_Entries">Index_Entries</a></h4>
<PRE>
 
   read a non-blank line from a text file 
 </PRE>
<h4>Link to routine iswhsp_c source file <a href='../../../src/cspice/iswhsp_c.c'>iswhsp_c.c</a> </h4>

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   <pre>Wed Jun  9 13:05:25 2010</pre>

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